“Real Housewives of New York City” star Kelly Bensimon (pictured) was batting away hordes of young men as she celebrated her March Playboy cover at club LIV in Miami Beach the other night. Bensimon, 40, a mother of two, had “hundreds” of guys in their 20s “vying for her attention,” a spy reports, adding: “All the guys circling her were under 25. One who couldn’t have been older than 23 sent over three bottles of Dom Perignon for Kelly and her friends.”